Musschenbroek, Petrus van
,
Physicae experimentales, et geometricae de magnete, tuborum capillarium vitreorumque speculorum attractione, magnitudine terrae, cohaerentia corporum firmorum dissertationes: ut et ephemerides meteorologicae ultraiectinae
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nearum, dein decreſcunt, donec in immediato contactu repulſio tan-
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tum ſit æqualis 13 granis; </
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<
s
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xml:space
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">quid igitur eſt in Magnetibus, quod hanc
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Anomaliam producit? </
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<
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">an dicam Lapidem, qui examini inſerviit,
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conſtare ex partibus valde heterogeneis, quarum quædam attrahunt,
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quædam repellunt, & </
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<
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">quæ ambæ vires oppoſitæ ex eodem loco Ma-
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guetis effluunt, hinc turbantes proportionem vel ſimplicis repulſio-
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nis vel attractionis? </
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<
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">veroſimile hoc apparet, quamobrem qui ſolam
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repulſionem cognoſcere vellet, perſpectam habere deberet vim At-
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trahentem eorundem polorum, eamque addere virtuti repellenti ob-
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ſervatæ, tum ſumma indicaret totam vim repellentem: </
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">Attractionem
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autem ſimul cum repulſione dari patet ex Experimento XIII. </
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quo ad diſtantiam 3 pollic. </
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">& </
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">ad minorem attractio præpolle-
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bat repulſioni, hinc magnes ex Libra ſuspenſus attrahebatur, non
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repellebatur, & </
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">ad diſtantiam 5 linearum
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proportio repulſionis erat minor quam attractionis, unde quoque re-
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pulſio imminui videbatur in minoribus diſtantiis, quæ tamen procul
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dubio augebatur, quo Magnetes propius ſibi admovebantur, ſed
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ab attractione tantopere turbabatur, ut inde oborta fuerit ſumma ir-
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regularitas, quæ in ipſis obſervabatur Experimentis, cum ad diſtan-
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tias 10, 11, & </
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">4 linearum æqualis repulſio obtinuerit, & </
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in diſtantia 7 linearum fuerit: </
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">confirmabar in hac ſententia, poſt-
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quam attractiones in Experimento III. </
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<
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tes, & </
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<
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">notatas, addideram repulſionibus, tum enim quædam regu-
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laritas dabatur, maximaque repulſio foret in contactu immediato,
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minor in aliquo Magnetum intervallo, & </
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">ſemper decreſcens aucto inter-
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vallo, quemadmodum patebit in hac Tabula, exhibente attractiones no-
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tatas in Experimento tertio, & </
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mul cum Summa ex attractione addita repulſioni, quam hic volumus.</
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Attract. \\ poll. # Lin. # gran.
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12 # 0 # {1/20}
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11 # 0 # {1/8}
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# 12 # 70 {1/2}
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# 10 # 87
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# 7 # 114
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Repulſ. \\ poll. # Lin. # gran. # Summ. tota \\ repulſion.
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11 # 11 # {1/2} # {3/40}
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10 # 9 # {3/4} # {7/8}
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# 12 # 24 # 94 {1/2}
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# 10 # 24 # 111
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# 7 # 25 # 139
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